Matt Baker was in custody awaiting sentencing for attempted murder when he made the “Alcatraz” style escape – with the 28-year-old allegedly found hiding under his sister’s bed at her home in Ilford, north London.

The prisoners possibly had help to break out of the highly secure facility

Then they cut through the bars on their window using a diamond-tipped saw smuggled into London’s Pentonville prison from the outside, possibly using a drone.

Seconds later they wriggled through the tiny gap, dropped on to a flat roof and lowered themselves to the ground using “ropes” fashioned from their sheets.

After sprinting to the perimeter, unseen by CCTV operators, they scaled a 25ft wall, almost certainly with the help of pals outside. Last night both remained at large as Scotland Yard launched a huge manhunt.

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Jail staff discovered the 10.40pm breakout only 12 hours later — having failed to spot the men were missing during at least three “heads on beds” checks.

A source said: “Remand prisoners do not have to leave their cells early and the only checks that were made were cursory, through the flap of the cell door.

Three jailbirds dug their way out of Cell Block B using spoons in June 1962

Two inmates escaped Pentonville Prison, clambering out over the 25-ft wall to freedom

Alarms began to ring throughout the prison about midday when prison officers confirmed the inmates were missing.

The audacious jailbreak echoes the notorious 1962 escape from Alcatraz island - made into a film starring Clint Eastwood - in which convicts made dummy heads out of paper and hair from the prison barber.

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